D2D Logical Channel Group Resource Allocation

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Solution Overview

Problem

Current D2D communication systems face challenges with insufficiently timely and reliable data transmission due to resource allocation issues, where user equipment may not obtain resources through contention, leading to delays and unreliability in data transmission.

Innovation Solution

A method and device that determine a logical channel and logical channel group for D2D data based on data type, with user equipment reporting data volume to a network device, which allocates resources accordingly, ensuring timely and reliable data transmission by prioritizing data based on service type and priority.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If user equipment obtains transmission resources through contention in current D2D communication, then resource allocation flexibility is improved, but transmission reliability and timeliness deteriorate because some user equipments cannot obtain resources

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoidtransmission reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements dynamic resource allocation by introducing multiple logical channel groups (LCG1, LCG2, LCG3, LCG4) that can be selectively activated based on data priority and channel conditions. The network device dynamically assigns resources to different LCGs, allowing the system to adapt between contention-based and scheduled allocation modes depending on service requirements, thereby maintaining both flexibility and reliability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent segments the data transmission channel into multiple logical channel groups (LCG1-LCG4), each handling different priority levels or service types. This segmentation allows critical data to be transmitted through dedicated scheduled resources while non-critical data uses contention-based resources, resolving the contradiction between flexibility and reliability by separating traffic classes.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If user equipment uses contention-based resource allocation in D2D communication, then system complexity is reduced, but transmission timeliness deteriorates due to resource acquisition delays

Engineering Contradiction:

Improvesystem complexityVSAvoidtransmission delay

Core Design Contradiction:

Device complexityVSLoss of time

Solution Approach 1:

The patent implements preliminary resource allocation by having the network device pre-assign resources to different logical channel groups before data transmission occurs. When data arrives at a user equipment, the device simply needs to identify the appropriate LCG and use the pre-assigned resources, eliminating the time-consuming contention process while maintaining manageable system complexity through standardized procedures.

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If uniform resource allocation is used for all D2D data, then allocation simplicity is improved, but transmission reliability deteriorates for high-priority data

Engineering Contradiction:

Improveallocation simplicityVSAvoidtransmission reliability for high-priority data

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies local quality by assigning different resource allocation characteristics to different logical channel groups. High-priority data in LCG1-LCG2 can be allocated with guaranteed resources and higher reliability parameters, while low-priority data in LCG3-LCG4 uses simpler allocation schemes. This allows the system to optimize reliability where needed while maintaining overall operational simplicity.

Inventive Principle:

Principle #3Local quality

4Loss of time

If D2D communication establishes direct links between user equipments, then network forwarding delay is reduced, but resource allocation reliability deteriorates due to lack of network control

Engineering Contradiction:

Improvenetwork forwarding delayVSAvoidresource allocation reliability

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The patent introduces the logical channel group mechanism as an intermediary layer between the user equipment and the network device. The LCG structure allows direct D2D communication to reduce forwarding delay while the network device maintains control over resource allocation through LCG configuration and scheduling, thereby preserving both speed and reliability through this intermediate organizational layer.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11659532B2User equipment, network device, and data transmission method

Publication Date: 2023.05.23 HUAWEI TECH CO LTD

AI summary

The present disclosure is directed to a D2D data transfer method, and user equipment and a network device that use the method. In one method, user equipment determines a logical channel used for to-be-transmitted Device to Device (D2D) data. The user equipment determines a logical channel group corresponding to the logical channel. The user equipment reports, to a network device, a D2D data volume of the logical channel group for the user equipment. The user equipment sends, on a D2D resource that is allocated by the network device to the user equipment according to the D2D data volume, the to-be-transmitted D2D data to another user equipment by using the determined logical channel.